Scroll Compressor Bolt Fracture Prevention
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Solution Overview
Problem
The axial compliance mounting mechanism in scroll compressors is prone to bolt fracture due to fatigue, leading to potential damage and failure.
Innovation Solution
The design offsets the axial position of the equivalent acting point of the force applied to the axial compliance mounting mechanism towards the main bearing housing, reducing the distance from the acting point to the potential fracture position, thereby alleviating or preventing bolt fracture. This is achieved by modifying the flange and connecting portion configurations, including convex sections and extending features, which optimize the distribution of forces and reduce stress on the bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial compliance mounting mechanism uses conventional bolt and sleeve configuration, then the structure is simple, but the bolts are prone to fatigue damage and fracture
Solution Approach 1:
The patent offsets the axial position of the equivalent acting point of force from the geometric center of the flange toward the main bearing housing. This dimensional repositioning in the axial direction creates an asymmetric force distribution that reduces the bending moment on the bolts, thereby improving fatigue strength without fundamentally changing the mounting mechanism structure
Solution Approach 2:
The patent introduces asymmetry by positioning the equivalent acting point of force at a distance from the geometric center of the flange. This asymmetric configuration creates a more favorable stress distribution pattern that reduces peak stresses on the bolts during operation, preventing fatigue failure
2Strength
If the flange is positioned with its geometric center, then the structure is symmetric and simple, but the moment at the fracture position is high causing bolt failure
Solution Approach 1:
The patent repositions the flange in the axial dimension such that the equivalent acting point of force is offset from the geometric center toward the main bearing housing. This axial repositioning reduces the lever arm and bending moment at the bolt fracture position, enhancing bolt strength without requiring flange material or cross-sectional changes
Data Source
AI summary
A scroll compressor includes a fixed scroll, a movable scroll, a main bearing housing and an axial compliance mounting mechanism. The fixed scroll is engaged with the movable scroll to compress a working fluid. The main bearing housing has a bearing surface for supporting a movable scroll end plate. The fixed scroll is fixedly connected to a connecting portion of the main bearing housing by the axial compliance mounting mechanism so that the fixed scroll can move in the axial direction by a predetermined distance. The fixed scroll further includes a flange extending radially outward from a circumferential wall portion, having an axial geometric center position between a first surface and a second surface and positioned such that the axial geometric center position is closer to the movable scroll end plate than the axial middle position thereof. The structure can prevent or reduce damage to the axial compliance mounting mechanism.